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Summary of Restricted Stock Award Activity (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of Shares      
Outstanding at beginning of period 568,057 721,752 95,315
Awarded 734,823 610,143 996,990
Released (227,616) (219,187) (80,428)
Forfeited (663,855) (544,651) (290,125)
Outstanding at end of period 411,409 568,057 721,752
Weighted Average Fair Value      
Outstanding at beginning of period $ 6.54 $ 6.88 $ 16.75
Awarded 6.81 6.72 8.38
Released 6.60 7.99 16.46
Forfeited 6.77 6.61 12.61
Outstanding at end of period $ 6.61 $ 6.54 $ 6.88